Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eaea3e601473fa…

MALICIOUS

PDF

83.8 KB Created: 2021-04-28 06:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3ffcdd803fc06cecd28302826a6359a SHA-1: 9b602994630ee5ae87dbefcd736ba2906f8f3fe7 SHA-256: 90eaea3e601473faf4bde9f182c0c7bfd1f59c064ad8cf665d4687aeb24ca241
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=warrior+cats+books PDF link annotation
    • http://purpless.vip/how_to_change_hp_deskjet_2544_ink_cartridgec4bvt.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://bulejoge.weebly.com/uploads/1/3/0/7/130775594/wilikirer-fesezorob-lajipa-lumosavun.pdfIn PDF document text
    • http://silkhfig.bid/the_hound_of_the_baskervilles_2002_full_movie_onlinecvjt6.pdfIn PDF document text
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/nobaxipasunezol.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jasAjeQ/nizesulabete.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/bLhbeNq/68558015235.pdfIn PDF document text
    • http://vuvuga.xyz/bomedupetamodozukomixengfp82.pdfIn PDF document text
    • http://ecoterritory.store/diane_stupar-hughes_agelhozp.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/witezajo_tikeruw.pdfIn PDF document text
    • http://wegansit.space/ar_reading_list_for_3rd_grade1pi9m.pdfIn PDF document text
    • https://cdn.sqhk.co/jadosoxiko/ghgiSjf/76019500046.pdfIn PDF document text
    • https://lazabegikazake.weebly.com/uploads/1/3/5/3/135315211/6515201.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/jeGjg3J/piezo_buzzer_arduino_function.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/23bf7a4b.pdfIn PDF document text
    • http://meetsoda.club/78712816450o4xjo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c6cb326-b780-40cc-bfd5-fbcdf1f4536a/56735136210.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_622191767b8542fe9a47a29ecd89c870.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52e2326-ebfb-470d-a322-a458cce77441/9676969616.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_b5854d47bd4f4e54aa2158ac73711af7.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_34f62e54d0144168ab811f5779e48862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b543a3-4da6-4354-b362-2028751e9656/hound_of_the_baskervilles_1983_dvd.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_9da773f1578b4f83aad5a11b1f6ba2cd.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 4544 bytes
SHA-256: 6e00f1913d4c4e30be1ab9ff2f85a448d4bca8cff8b01d1759f786e702618072
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 11848 bytes
SHA-256: f8c83debecb63189d5e9bbae6ab68173e5769fb0768d844518ae2b152c87183d
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3